Vlad K., this bug report is being closed due to your last comment
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1502459/comments/7
regarding this being fixed with an update. For future reference you can
manage the status of your own bugs by clicking on the current status in
the yellow line
This problem does not appear in Ubuntu 15.10 with the default 4.2 Linux
kernel.
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https://bugs.launchpad.net/bugs/1502459
Title:
10de:0615 Selecting in LibreOffice Writer when running